The newer catachan models are much better - The old ones had bisceps larger than the marines shoulder pads, but the newer models have been scaled back. I've got a guard army based on cadian models but in order to create some veterans I purchased the catachan command box and an infantry box and mixe them with the equivalent in cadians - my vets now run round in a mix of fatigues, some with cadian kevlar and some catachan vests - some with bare arms, some with shirts. They mix well, and look realistic now. If I get chance later I'll do a couple of pics for you.
